Machine for grinding glassware



A. B. KNIGHT.

MACHINE FOR GRINDING GLASSWARE.

APPLICATION FILED APR.24. I920.

1 ,364,94=O. Patented Jan. 11, 1921.

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APPLICATION FILED APR.24.;1920.

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MACHINE FOR GRINDING GLASSWARE.

APPLICATION FILED APR. 24. 1920 1 Patented Jan. 11, 1921 5 SHEETS-SHEET 3.

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A. B. KNIGHT.

MACHINE FQ'R GRINDING GLASSWARE.

APPLICATION FILED 111 11.24. 1920.

1,364,940.. Patented Jan. 11,1921.

5 SHEETS-SHEET 4- ABM/23 A. B. KNIGHT. MACHINE FOR enmnmc GLASSWARL APPLICATION FILQED APR. 24. 1920.

1,364,940. Patented Jan. 11,1921.

5 SHEETSSHEET 5- ALBERT BREAKENRIDGE KNIGHT, OF FAIRMONT, WEST VIRGINIA.

MACHINE FOR GRINDING GLASSWARE.

Specification of Letters Patent.

Patented Jan. 11, 1 921.

Application filed April 24, 1920. Serial No. 376,356.

To all whom it may concern:

Be it known that I, ALBERT B. KNIGHT, a citizen of the United States, residing at Fairmont, in the county of Marion and State of West Virginia, have invented certain new and useful Improvements in Machines for Grinding Glassware, of which the following is a specification.

This invention relates to a machine for grinding the cracked off ends of glassware, such as drinking glasses, while not necessarily restricted to this use.

An important object of the invention is to provide a machine of this type, adapted for simultaneously grinding a number of glasses. In the present invention, I have provided means whereby even operation of the different spindles may be obtained. The treadles by means of which the chucks carrying the glassware being ground are shifted to and from the grinding element, require different pressures in order to cause the chucks to perform. the same shifting movement. Very often, one of the grinding units of the machine would remain idle because the operator found diiiiculty in operating that particular chuck, from the extra weight necessary to operate the treadle. I have devised a machine wherein the action of the treadle of each of the units is even; in other words, the same weight applied to the same distance to each of the treadles will give the same result in shifting the chucks of the units.

A further object is to provide a belt drive for machines of this character, which will permit the various units to be arranged in a straight line across the machine.

A further object of the present invention is to produce a machine for grinding tum blers and Stemware wherein a single belt is employed to drive a number of grinding shafts on the bed of the machine. The provision of a single drive belt is further advantageous as it eliminates a great deal of trouble caused by slipping of the belt, broken belts, etc.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals designate like parts throughout the same,

Figure l is a plan View of a machine embodylng my invention,

Fig. 2 is a side elevation of the same,

Fig. 3 is a section taken on line 3-3 of Fig. 2,

Fig. 4 is a section taken on line 4r-4 of Fig. 2,

Fig. 5 is a section taken on line 5-5 of Fig.

Fig. 6 is an enlarged section taken on line 66 of Fig. 1,

Fig. 7 isa section taken on line 7-7 of Fig. 1,

Fig. '8 is a section taken on line 8--8 of Fig. 1, I

Fig. 9 is a plan view of the treadle mechanism, detached,

Fig. 10 is a detail view showing the line of the treadle levers, and

Fig. 11 is a perspective view of the latch mechanism, detached.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 10 designates a preferably horizontal support having a rectangular, upstanding flange 11, constituting a tray. This support or tray is arranged upon legs l2, as shown. The support 10 is provided with a transverse pocket 14, forming a trough, which is provided with an outlet pipe 15, as clearly shown in Fig. 4. This trough extends transversely of the machine, and appproximately centrally of the tray, as clearly shown in Fig. 1. The outlet pipe 15 may discharge at any desired point.

Arranged upon the support 10 is a plurality of operating units 16, which are identical and only one of which will be described in detail.

Each unit 16 comprises stationary journal boxes or bearings 17, which are bolted or otherwise rigidly secured to the support 10, as shown at 18 (Fig. 6). These bearings receive a horizontal tubular spindle 19, having a pulley 20, rigidly secured thereto and engaged by a belt 21. The pulley 20 is arranged between the bearings 17 and thrust ball bearings 22 are disposed between the pulley 20 and the bearings 17. At the left end, the tubular spindle 19 is provided with a conical portion 23, increasing in diameter to the left or away from the bearings 17. The larger end of this conical portion is slightly smaller than the exterior diameter of the left end of the tubular spindle to permit the passage of a nut 24, having screwthreaded engagement with such left end, as at 25. The function of the conical portion 23 is to cause water which may accumulate upon this conical portion interiorly and eX- teriorly to be acted upon by centrifugal force and conducted away from the bearing 17, thereby preventing this bearing from being injured by the water.

Adjacent the left end of the tubular spindle 19 is a vertical water receiving housing 26, having a base 27, bolted or otherwise rigidly secured to the support 10. This housing is provided upon its right side and near its top with circular opening 27, receiving the left end of the conical portion 28. A plate 28 is secured to, or formed integrally with, the opposite side of the housing 26, and there is an outlet opening 30, beneath this plate. The plate 28 is provided with a tubular boss 31, receiving a water supply tube 32.

The numeral 2-54 designates a housing arranged adjacent the bearing 17 to the right, this housing including a lower portion 85 which is vertically arranged and bolted to the lower portion of the bearing 17, as shown at 36. The housing further comprises an upper portion 37, which rests upon the lower portion and may be removed therefrom. The lower portion 85 carries upon its sides, exterior flanges 30, which receive the upper portion 87, upon the upper surface thereof.

At its right end, and within the housing 34, the tubular spindle 19 is provided with a conical portion 40, similar to the conical portion 23. This conical portion 40 carries a cylindrical extension 41, which is screw-threaded to engage with a chuck 42, receiving a grinding stone 43, held in place by any suitable means. This stone is provided centrally thereof with a water outlet opening 45, into which the water supply tube 32 extends.

Each unit further comprises a pair of spaced horizontal guide rods 46, having their forward ends slidable within stationary sleeves 48, carried by one of the bearings 17, preferably the right hand end hearing. The rear ends of these guide rods 46 extend through sleeves 51 (see Fig. 8), rigidly secured to a bracket 52, the guide rods being slidable therein. The bracket 52 embodies a base 54, bolted to the support 10, as at 55.

Each unit further comprises a horizontal reciprocatory carriage 56, having sleeves 57, secured to its lower end. The carriage 56 is provided at its upper end with a tubular head 59 receiving a tubular coupling 60, clamped therein, in any suitable manner. The outer end of this tubular coupling is provided with suitable means, such as screw threads (not shown) to receive thereon one end of a chuck 62 for receiving and holding the glasses, the same being provided at its open free end with an interior ring 63, formed of leather or other fibrous material to prevent the glasses being broken, as is common.

The numeral 64 designates an ejector rod which is clamped in the tubular head 65, formed upon the top of the bracket 52, by a set screw 66, or the like. This ejector rod is longitudinally adjustable and extends through the tubular coupling 60 into the chuck 62, to contact with the glass and eject the same through the forward open end of the chuck when the chuck is moved to the extreme position to the right.

Means are provided to limit the forward movement of the carriage 56 so that the forward end of the chuck cannot contact with the stone 43, in event that the glasses should break or that the chuck should be released for forward movement when not provided with a glass. Such means comprises a rod 67 slidably mounted through an opening 68 formed in the bracket The forward end of this rod is rigidly secured to the carriage 36, in any desirable manner, and the rear end thereof is screw-threaded, as shown at 70, to receive an adjusting nut 71, adapted to beshiftcd longitudinally upon the rod 67, and contacts with the bracket 52. The rod 67 is provided intermediate its ends with a flattened portion 72, (see Figs. 7 and 8), adapted to be engaged with a notch 73, of a latch 74, pivoted to the bracket 52, as shown at 75. lVhen the carriage is moved to the right, or to the open position, the fiattened portion 72 will move in proximity to the latch 74, which may then be swung to the horizontal position so that the flattened portion will enter the notch 7 3 thereof. This latch will then hold the carriage 56 from returning to the closed position to the left, as the'latch will engage the shoulders of the flattened portion 72. It is thus seen that means are provided to lock each carriage and its chuck in the proper position.

Pivotally connected to the carriage 56, as at 57, (see Fig. 5) is an operating rod 78, the rear end of which is screw-threaded, as shown at 79. A nut is arranged upon the end of the operating rod, the nut being adjustable to permit adjustment of the travel of the carriage. A pivoted bell crank lever 84 having a vertical arm 83 is slidably mounted on the end of the operating rod, the end of the lever arm being provided with 81 having openings adapted to receive the end of the rod. The lever is provided with a sleeve 85 integral therewith for pivotally receiving a supporting shaft 86. This shaft is mounted in brackets 88, bolted to the legs of the machine.

To the horizontal arms 89 of the bell crank levers 84, links 90 are pivotally connected. Brackets 92 are secured to the lower face of the support 10, in any suitable manner, and have mounted therein, a shaft 91. Pivotally mounted upon the shaft are levers 93, corresponding in number and arrangement to the bell crank levers 84. To one arm 94 of the levers 93, the free ends of the links 90 are connected. .The arms 94 of the levers 93 are of the same length. The other arms 95 of the levers are of varied length for a pur ose presently to appear.

ounted in brackets 96, secured to the legs 12, in any suitable manner, is a shaft 97 upon which are rotatably mounted sleeves 98, having extensions which receive and'are bolted to one end of treadle levers 99. The free ends of the treadle levers 99 are rovided with foot receiving parts 100. ivotally secured to the treadle levers 99, as at 101, are links 102, having their upper ends secured to the ends of the, arms 95 of the levers 93, as at 103.

An inspection of Fig. 9 will reveal the fact that the lever 93, having the shortest arm 95, is connected to its treadle lever 99 in such a manner as to have the greatest leverage. It will also be noted that the treadle levers which are of the same length are connected with the arms 95 at spaced intervals. These points of connection, together with the varied leverages obtained thereby and the varied leverages given by the levers 93 are so proportioned as to give aneven throw to the end of the arms 94, when the same movement is applied to the three principal levers 99. These levers are also proportioned in such a manner that the weight delivered at the ends of the levers above mentioned will be the same. From the foregoing, it will be obvious that the same throw and weight are imparted to the upper ends of each of the vertical arms 83 of the bell crank levers 84.

The pro-portions of the levers 99 and the lengths of the arms 94 and 95 of the levers 93 may be arrived at by first determining the points upon the levers 99 to which it is desired to attach the arms 95 of the levers 93, and then dividing the poundage delivered for a given pull on each of the treadles at the point to which the arm 95 and the lever 93 corresponding thereto is to be attached into a desired resultant to be delivered at the end of the arm 94, the proportionate lengths of the arms 94 and 95 may be determined. It will be found that in each instance, the treadle lever which is connected nearest its point of pivot to its corresponding arm 95 will require the shortest arm 95 and that the distancebetween the point of connection with the links 102 to the treadles 99 and the pivot of the treadles 99 will be proportionate to the arms 95 of the levers 93. The arms 94 of the lever are, of course, a constant.

Mounted upon a suitable platform 104,

supported by the legs 12, is a motor 105. The support 10 is provided beneath each of the portions 20 with openings 106, the edges of the openings being provided with up standing flanges 107, to prevent the overflow of water through the openings 106. Mounted intermediate the openings 106 are brackets 108, rotatably receiving pulleys 109. The belt 21 passes about the pulley 110 of the motor 105, upwardly through the openings 106 to one side of the machine, about the pulley arranged thereabove, downwardly through the same opening, about the pulley 109 arranged intermediate this opening, and the next adjacent opening, upwardly through the second opening, about the second pulley 20, downwardly through this opening, about the second pulley 109, upwardly through the last of the openings, about the pulley 20 arranged thereabove, and downwardly to the pulley 110 of the motor. It will be seen that but a single belt is used to drive the three units 16, whereas in the type of machine represented by the patent hereinbefore mentioned, the use ofthree belts was necessary. Furthermore, by the adaptation shown in the drawings, it becomes readily possible to place above the pulleys and their associated rotating parts, a protecting screen, which prevents accidents which may occur from accidental catching of the workmans garments or hands in the belt 21. It will be seen that the flanges 107 will prevent any water which may collect in the tray from over-flowing to contact the motor or belt, and interfere with the operation thereof.

It will be obvious from the foregoing description that equal weights applied equal distances to the treadle 100 of the treadle levers 99 will cause the carriages 56 and their associated elements to move to the right against the action of the weights 111, for the same distance. It will furthermore be obvious, by inspecting Fig. 1, that the operator does not have to reach to one side, in operating the machine, as is the case in the patent mentioned, and that, therefore, there will be no single unit 16 which will be more difficult to operate than the others, and which will therefore, probably remain idle.

It will be apparent that the improved drive used in connection with this machine has many advantages over the prior constructions wherein the separate grinding shafts are driven by belts passing over pulleys on an overhead line shaft. The belt, pulling directly down on the pulleys on the grindingshafts eliminates the tendency toward vibration of the grinding stone when the shafts and bearings become worn. The use of a single belt eliminates many causes of trouble in the machines of the prior art. As it is well known, belts frequently break and frequently stretch to the point where they require tightening. The use of as few belts as possible in a machine of this character is desirable.

A further advantage of the use of a single belt is that the percentage of slipping on all the shafts is the same. During use, belts stretchso that they do not furnish the same power to the driven shaft afterthey have been in use for some time. Where a number of belts are used to drive the grinding shafts, the degree of stretching will not be the same in all and the grinding stones will be driven at different speeds. It is advantageous to have all of these grinding stones driven at the same speed and this result is obtained wherein a single belt is employed to drive all the shafts.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In apparatus for grinding glassware, a support, a plurality of elements for holding and rotating grinding members, a plurality of chucks for receiving the articles to be ground and connected with the support to be moved toward and away from the grinding members, means to successively move the chucks in one direction, embodying treadle levers corresponding in number and arrangement to said chucks, and a system of levers connecting each of said treadle levers and its corresponding chuck, said levers being so proportioned that shifting of said treadle levers through 'oqual'distances will cause said chucks to move equal distances,'and means to move the chucks inthe o posite direction.

2. In apparatus or grinding glassware, a support, a plurality of elements for holding and rotating grinding members, a plurality of chucks for receiving'the article to be ground andconnected with the support to be moved toward and away from the grinding members, means to successively move the chucks in one direction, embodying a plurality of pivotally mounted bell crank levers corresponding in number and arrangement to said chucks, a plurality of treadle levers pivoted at their ends, a plurality of levers pivoted intermediate their said last named levers having'their arms at one side of the pivot points thereof of equal length and connected with one arm of said bell crank levers, the other arms of said levers being of varied lengths, said last named arms being connected with said treadle levers at points spaced from the pivot points thereof varying directly in proportion to the length ofthe arm to which it is attached, the free arms of said bell crank levers being connected to said chucks whereby equal pressures exerted through equal distances on each of said treadle lovers will cause the chucks to be moved equal distances by equal pressures, and means to move the chucks 1n the opposite directlon.

in testimony whereof I alhx my signature in presence of two witnesses.

ALBERT BREAKENRIDGE KNIGHT.

.Vitnesses C. D. CONAWAY, Eow. C, BLooK. 

